Slave not found Master

Hy folks.

I created a DNS slave on another server with virtualmin as a very good article I found here on the site. However, the DNS server that functions as a slave does not start because the BIND nameserver can not resolve ns1.mydomain.tld (master server). The error: Unable to find masters list ‘ns1.mydomain.tld’

Does i have to create a master zone on slave server with a reverse record?

Thanks for the help.